CN109343596B - Cell-phone temperature regulating device based on phase change capsule and bionical microchannel - Google Patents
Cell-phone temperature regulating device based on phase change capsule and bionical microchannel Download PDFInfo
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Abstract
The invention discloses a mobile phone temperature control device of a phase change capsule and a bionic microchannel, which comprises a mobile phone shell and a heat dissipation plate, wherein a groove is formed in the mobile phone shell; be equipped with bionical microchannel on the heating panel, be equipped with the deionized coolant liquid as cycle fluid in the bionical microchannel, the pipe-line system of the organism of utilizing the nature no matter all has the superiority in the aspect of heat transfer or pressure loss, heating panel through high heat conduction can channel into radial runner part with the heat rapidly, cycle fluid through the runner, the heat can derive the casing lower part region rapidly and dispel the heat promptly the heating panel back, distribute in the imbibition core in the heat dissipation runner, provide fluidic cycle's power in the microchannel through capillary effect, guarantee that the heat can derive rapidly, reach effective heat dissipation and the control by temperature change to the cell-phone. So as to realize low energy consumption, compactness and high efficiency heat dissipation of the portable mobile electronic equipment.
Description
Technical Field
The invention belongs to the field of enhanced heat transfer; in particular to a mobile phone temperature control device of a phase change capsule and a bionic micro-channel.
Background
With the development of the semiconductor industry and the internet industry, portable computing devices represented by mobile phones have an increasingly important position in social life, and heat dissipation of electronic devices has become a hot spot of current research. At present, the electronic device functions are mainly realized on the basis of silicon-based chips, and the consumed electric energy is finally dissipated into the environment in a heat mode, so that the temperature of the environment rises. The high temperature environment can seriously damage the working performance of the silicon-based chip and shorten the service life of the silicon-based chip, which can lead to huge waste of energy and resources. Therefore, the heat dissipation problem of electronic devices is worthy of attention. However, the heat dissipation system suitable for the conventional computing device, such as a high performance computer, has almost no limitation on space occupation or energy consumption of the heat dissipation system, and is often large in size, noise and power consumption, and thus cannot meet the heat dissipation requirement of the portable mobile electronic device.
At present, the heat dissipation effect of common mobile phone shells on the market is generally poor, and the quantity of the heat dissipation mobile phone shells applying the heat transfer enhancement theory and the technical design is very small.
Disclosure of Invention
The invention aims to provide a mobile phone temperature control device of a phase change capsule and a bionic micro-channel, which overcomes the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a cell-phone temperature control device of phase change capsule and bionical microchannel, includes cell-phone casing and heating panel, and the cell-phone casing is inside to be equipped with the recess, and the heating panel is placed in the recess of cell-phone casing, is equipped with bionical microchannel on the heating panel, is equipped with the deionization coolant liquid as cycle medium in the bionical microchannel, still is equipped with capillary imbibition core in the bionical microchannel.
Furthermore, at least one surface of the heat dissipation plate is provided with a bionic micro channel, the bottom of the groove of the mobile phone shell is of a through hole structure, a plurality of stop blocks are arranged on the periphery of the inner side of the groove of the mobile phone shell, and the heat dissipation plate is clamped in the mobile phone shell through the stop blocks and the partition plates; one surface of the heat dissipation plate is in contact with the partition plate, and the other surface of the heat dissipation plate is in direct contact with air.
Further, the bionic microchannel comprises a radiation tree-shaped bionic microchannel arranged on the upper half part and a parallel tree-shaped bionic microchannel arranged on the lower half part; a temporary storage and buffer place for a circulating working medium is arranged in the middle of the radiation tree-shaped bionic micro-channels, and blank areas among the radiation tree-shaped bionic micro-channels are phase-change material arrangement areas; working medium circulation channels which are communicated with the radiating tree-shaped bionic micro-channels and the parallel tree-shaped bionic micro-channels are arranged on the periphery of the radiating plate.
Furthermore, the branching angle of the radiating tree-shaped bionic micro-channel and the parallel tree-shaped bionic micro-channel is 80-120 degrees.
Further, the branching angle of the radiating tree-shaped bionic microchannel and the parallel tree-shaped bionic microchannel is 100 degrees.
Furthermore, the ratio of the upper-level to the lower-level pipe diameter of the radiating tree-shaped bionic micro-channel to the parallel tree-shaped bionic micro-channel is 0.7-0.9.
Further, the ratio of the upper-level to the lower-level pipe diameter of the radiating tree-shaped bionic microchannel to the parallel tree-shaped bionic microchannel is 0.8.
Furthermore, the working medium circulation channel adopts a capillary liquid absorption core as capillary pressure to drive fluid to flow.
Furthermore, the mobile phone shell is made of materials such as silica gel or rubber, the partition plate is made of metal sheets, and organic or inorganic phase change microcapsules are arranged in the phase change material arrangement area.
Furthermore, the heat dissipation plate is a copper substrate or an aluminum substrate.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a mobile phone temperature control device of a phase change capsule and a bionic microchannel, which comprises a mobile phone shell and a heat dissipation plate, wherein a groove is formed in the mobile phone shell; be equipped with bionical microchannel on the heating panel, be equipped with the deionized coolant liquid as cycle fluid in the bionical microchannel, the pipe-line system of the organism of utilizing the nature no matter all has the superiority in the aspect of heat transfer or pressure loss, heating panel through high heat conduction can channel into radial runner part with the heat rapidly, cycle fluid through the runner, the heat can derive the casing lower part region rapidly and dispel the heat promptly the heating panel back, distribute in the imbibition core in the heat dissipation runner, provide fluidic cycle's power in the microchannel through capillary effect, guarantee that the heat can derive rapidly, reach effective heat dissipation and the control by temperature change to the cell-phone. So as to realize low energy consumption, compactness and high efficiency heat dissipation of the portable mobile electronic equipment.
Furthermore, most of heat is taken away by cooling liquid fluid of the bionic micro-channel through convection, and the cooling liquid fluid is distributed in the phase change microcapsule area on the upper portion to absorb redundant heat, so that the temperature of the upper portion of the mobile phone is guaranteed not to exceed a rated value. According to the heating types of different mobile phones, different arrangement areas of the phase-change material can be designed, and different amounts of phase-change capsules are added to achieve the effect of controlling the temperature of different mobile phones. In addition, the arrangement mode of the bionic micro-channel can be used for carrying out arrangement in different places according to the heat dissipation requirements of different mobile phones, and the branching stage number can be changed to achieve different heat exchange effects.
Furthermore, the mobile phone shell is made of materials such as silica gel or rubber and the like, so that the mobile phone is protected; the partition plate is made of a metal sheet and plays a role in separating the mobile phone from the heat dissipation plate.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the bionic micro-channel heat dissipation plate according to the present invention;
FIG. 3 is a schematic diagram of a fractal parameter optimization structure of a microchannel.
FIG. 4 is a structural diagram illustrating the temperature of the lower surface of a solid as a function of the bifurcation angle.
Fig. 5 is a schematic diagram of the structure of the change of fluid pressure drop with the change of the bifurcation angle.
FIG. 6 is a perspective view of a radial tree-shaped fractal micro flow channel.
FIG. 7 is a perspective view of a parallel tree-shaped fractal micro flow channel.
In the figure: 1 is a heat dissipation plate; 2 is a radial tree-shaped bionic micro-channel; 3 is a phase change material arrangement area; 4, a temporary storage and buffer place of the circulating working medium; 5 is the substrate of the bionic micro-channel heat dissipation plate; 6 is a parallel tree-shaped bionic micro-channel; 7 is a working medium circulation channel; 8 is a clapboard; and 9 is a mobile phone shell.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, a mobile phone temperature control device of a phase change capsule and a bionic micro channel comprises a mobile phone shell 9, a partition plate 8 and a heat dissipation plate 1, wherein a groove is formed in the mobile phone shell 9, the heat dissipation plate 1 is placed in the groove of the mobile phone shell 9, and the partition plate 8 covers the upper end of the heat dissipation plate 1; the heat dissipation plate 1 is provided with a bionic micro-channel, and deionized cooling liquid is arranged in the bionic micro-channel and serves as a circulating working medium. Utilize baffle 8 to separate whole heating panel 1 and cell-phone, final cell-phone casing 9, heating panel 1 and baffle 8 encapsulation are as an organic whole, form whole heat abstractor.
The heat dissipation plate 1 is a bionic micro-channel heat dissipation plate; the bionic micro-channel in the heat dissipation plate 1 is a sealed channel;
at least one surface of the heat dissipation plate 1 is provided with a bionic micro-channel;
as shown in fig. 6 and 7, the bionic microchannel includes a radiation tree-shaped bionic microchannel 2 disposed on the upper half and a bionic microchannel 6 with parallel tree-shaped fractal disposed on the lower half; a temporary storage and buffer place 4 for circulating working media is arranged in the middle of the radiation tree-shaped bionic micro-channels 2, and a blank area between the radiation tree-shaped bionic micro-channels 2 is a phase-change material arrangement area 3; working medium circulation channels 7 which are communicated with the radiation tree-shaped bionic micro-channels 2 and the parallel tree-shaped bionic micro-channels 6 are arranged on the periphery of the heat dissipation plate 1; the working medium circulation channel 7 is annularly arranged, a capillary liquid absorption core is arranged in the working medium circulation channel 7, and fluid is driven to flow through capillary pressure.
The heat dissipation plate 1 is a copper substrate or an aluminum substrate;
organic or inorganic phase change microcapsules are arranged in the phase change material arrangement area 3;
the mobile phone shell 9 is made of materials such as silica gel or rubber and has the function of protecting the mobile phone;
the rear end of the mobile phone shell 9 is provided with an opening, a plurality of stop blocks are arranged on the periphery of the inner side of the mobile phone shell 9, and the heat dissipation plate 1 is clamped in the mobile phone shell 9 through the stop blocks and the partition plates 8; one surface of the heat dissipation plate 1 is in contact with the partition plate, and the other surface of the heat dissipation plate is in direct contact with air, so that heat dissipation of the heat dissipation plate is facilitated;
the partition plate 8 is made of a metal thin plate, and plays a role of separating the mobile phone from the heat dissipation plate 1 and transferring heat of the mobile phone to the heat dissipation plate 1.
The metal substrate of the heat dissipation plate 1 is formed by laser etching or micro milling. The bionic micro-channel is combined with various processing technologies, the accuracy of the bifurcation angle and the pipe diameter ratio before and after bifurcation of the bionic micro-channel needs to be ensured, the bionic micro-channel can be formed by laser etching processing or micro-milling processing, and the bionic micro-channel is preferably a 3D printing technology.
The branching angle of the radiation tree-shaped bionic micro-channel 2 and the parallel tree-shaped bionic micro-channel 6 is 80-120 degrees; the radiating tree-shaped bionic micro-channel 2 radiates bionic micro-channel branches to the periphery by taking the buffer place 4 as the center; forming a radial tree-shaped bionic micro-channel 2;
as shown in fig. 3, for the bifurcated pipe diameter ratio, according to the principle of minimizing energy consumption, the relationship between the bifurcation included angle and the pipe diameter restriction is obtained as follows:
according to the result of single-stage numerical simulation, the temperature uniformity is poor when the difference between the overall highest temperature and the overall lowest temperature is large when the bifurcation angle is small; when the branching angle exceeds 120 degrees, the heat dissipation effect is not obviously improved, but along with the increase of the angle, the resistance loss of the fluid is obviously increased, and in order to effectively drive the flow of the circulating working medium, the branching angle is not suitable to be too large. Not only can achieve good heat dissipation effect, but also can ensure that the resistance loss of fluid resistance is small, and the preferred branching angle of the radiating tree-shaped bionic micro-channel 2 and the parallel tree-shaped bionic micro-channel 6 is 100 degrees.
The upper-lower grade pipe diameter ratio of the radial tree-shaped bionic micro-channel 2 and the parallel tree-shaped bionic micro-channel 6 is 0.7-0.9; the flow distribution uniformity of the branch lower-level flow channel can be ensured;
when the transport flow is the same, the optimized fractal pipe diameters have the following relationship (wherein D is the diameter of the main pipe, and D is the diameter of the main pipe)iSub-tube diameter):
in order to simplify the flow channel arrangement and comprehensively consider the manufacturing difficulty and cost, a fractal mode of one-to-two is selected, and the sub-pipe diameters are equal. From this, it follows from the Murray theorem:
therefore, the pipe diameter ratio was determined to be 0.80. And the research on the branching angle of the pipeline is less in theoretical results, so that the influence of different branching angles on fluid flow and heat transfer is researched by using a numerical simulation method. The ratio of the upper-level and lower-level pipes of the preferred radiation tree-shaped bionic micro-channel 2 and the parallel tree-shaped bionic micro-channel 6 is 0.8; the parallel tree-shaped bionic micro-channels 6 are a plurality of multi-stage bionic micro-channels which are arranged in parallel; forming a parallel tree-shaped bionic micro-channel 6;
the generation method of the radial tree-shaped bionic micro-channel 2 and the parallel tree-shaped bionic micro-channel 6 adopts a recursive fractal algorithm based on Visual C + + language to generate.
The invention relates to a phase change capsule and bionic micro-channel mobile phone temperature control system, which comprises the following specific working processes:
when the mobile phone carries out tasks with large power consumption such as communication, game software running, video playing, shooting and the like for a long time, the heating power of an upper camera and a CPU area is increased sharply, heat can be led into a radial flow channel part rapidly through a high-heat-conduction cooling plate, the heat can be led out to the lower area of a shell body rapidly to be radiated through a circulating working medium of the flow channel, liquid absorbing cores distributed around the cooling flow channel provide power for fluid circulation in a micro flow channel through a capillary effect, the heat can be led out rapidly, and effective heat dissipation and temperature control of the mobile phone are achieved.
When the thermal power is further improved, most of heat is taken away by cooling liquid fluid of the bionic micro-channel through convection, and the cooling liquid fluid is distributed in the phase-change microcapsule area on the upper portion to absorb redundant heat, so that the temperature of the upper portion of the mobile phone is guaranteed not to exceed a rated value. According to the heating types of different mobile phones, different arrangement areas of the phase-change material can be designed, and different amounts of phase-change capsules are added to achieve the effect of controlling the temperature of different mobile phones. In addition, the arrangement mode of the bionic micro-channel can be used for carrying out arrangement in different places according to the heat dissipation requirements of different mobile phones, and the branching stage number can be changed to achieve different heat exchange effects.
And (3) selecting computational fluid dynamics analysis software ANSYSCFCX to carry out numerical simulation on the heat exchange flow condition of the model. The fluid working medium is selected to be water, the inlet flow velocity is 1.0m/s, the temperature is 20 ℃, and the outlet pressure is 101325 Pa. The physical property parameter of water is set as a constant, and the density is 103kg/m3The specific heat capacity is 4179J/(kg. DEG C.), and the dynamic viscosity coefficient is 8.55 × 10-4kg/(m.s), and a thermal conductivity of 0.613W/(m.DEG C). The Reynolds number Re obtained by calculation is less than 1000, so the flow model is laminar flow. The solid substrate material was pure copper with a density of 8920kg/m3The specific heat capacity is 386J/(kg DEG C.), and the thermal conductivity is 377W/(m DEG C.). The bottom of the round copper plate is set as a 10W uniform surface heat source, and the calculated heat flow density is 31831.92W/m2. The solid side, the solid top and the fluid top are all thermally insulating boundaries. The calculated residual is set to 10-4A steady state model is used.
The branching angle is changed, and the calculation results of the cooling effect and the fluid resistance loss of the model tree-shaped fractal micro-channel with the branching angle of 30-180 degrees are obtained through research. The cooling effect of the tree-shaped fractal micro-channel can be measured by comparing the temperatures of different models, wherein the average temperature can measure the overall cooling effect of the branched flow channel, and the lowest temperature and the highest temperature can measure the cooling uniformity of the fractal flow channel. As can be seen from fig. 4, when the branch angle θ is small or large, the average temperature is high, which indicates that the overall cooling effect is not good enough; when the branch included angle theta is small, the deviation of the maximum temperature and the minimum temperature from the average temperature is large, which indicates that the uniformity of heat dissipation is not good enough. From the perspective of heat dissipation in the local fixing area, the design of too large or too small branch included angle should be avoided as much as possible. When the included angle theta is between 80 degrees and 160 degrees, the average temperature of the whole area is lower, meanwhile, the deviation of the maximum temperature and the minimum temperature from the average temperature is smaller, the overall heat dissipation efficiency is higher, the uniformity is better, and the overall heat dissipation effect is more ideal.
However, the resistance loss of the fluid at different bifurcation angles also affects the performance of the microchannel heat sink. As shown in fig. 5, as the included angle θ of the branch increases, the flow pressure loss of the cooling medium increases, and it can be seen that the angle and the fluid pressure drop are approximately linearly related. The larger the branch angle theta is, the larger the flow pressure loss of the cooling working medium is linearly increased along with the branch angle theta. From the relationship between the heat dissipation effect and the branch angle θ, it can be seen that the difference of the heat dissipation effect is not particularly obvious when the branch angle θ is 80 ° to 160 °, especially when the branch angle θ is 120 ° to 160 °. At this time, the smaller the branch angle θ, the smaller the flow pressure loss of the cooling medium, which means that the energy consumption required for circulating the cooling medium is smaller.
The heat dissipation effect and the energy consumption required by the circulating cooling working medium are comprehensively considered, and the branch included angle theta is about 100 degrees, so that the heat dissipation effect is good, and the energy is saved. The results of this combined analysis are also closer to the observations.
In a word, when the flow rates of the branch flow passages on the two sides are equal, the pipe diameter of the flow passage after the branch is about 0.80 times of that of the flow passage before the branch. Near the optimized radiating included angle, the flow pressure loss of the cooling working medium is large, and the flow efficiency is not ideal; in comparison, the branch included angle theta is ideal when the angle is near 100 degrees, so that the heat dissipation effect is good, and the flowing efficiency of the cooling working medium is high.
Claims (8)
1. A mobile phone temperature control device based on a phase change capsule and a bionic micro-channel is characterized by comprising a mobile phone shell (9) and a heat dissipation plate (1), wherein a groove is formed in the mobile phone shell (9), the heat dissipation plate (1) is placed in the groove of the mobile phone shell (9), the bionic micro-channel is arranged on the heat dissipation plate (1), deionized cooling liquid is arranged in the bionic micro-channel and serves as a circulating working medium, and a capillary liquid absorption core is further arranged in the bionic micro-channel; at least one surface of the heat dissipation plate (1) is provided with a bionic micro channel, the bottom of a groove of the mobile phone shell (9) is of a through hole structure, a plurality of stop blocks are arranged on the periphery of the inner side of the groove of the mobile phone shell (9), and the heat dissipation plate (1) is clamped in the mobile phone shell (9) through the stop blocks and the partition plates (8); one surface of the heat dissipation plate (1) is in contact with the partition plate (8), and the other surface of the heat dissipation plate is in direct contact with air; wherein the bionic micro-channel comprises a radiation tree-shaped bionic micro-channel (2) arranged on the upper half part and a parallel tree-shaped bionic micro-channel (6) arranged on the lower half part; a temporary storage and buffer place (4) for a circulating working medium is arranged in the middle of the radiation tree-shaped bionic micro-channels (2), and a blank area between the radiation tree-shaped bionic micro-channels (2) is a phase-change material arrangement area (3); working medium circulation channels (7) which are communicated with the radiating tree-shaped bionic micro-channels (2) and the parallel tree-shaped bionic micro-channels (6) are arranged on the periphery of the radiating plate (1).
2. The temperature control device for mobile phone based on phase-change capsule and bionic micro-channel as claimed in claim 1, wherein the branch angle of the radiating tree-shaped bionic micro-channel (2) and the parallel tree-shaped bionic micro-channel (6) is 80-120 °.
3. The temperature control device for mobile phone based on phase-change capsule and bionic micro-channel as claimed in claim 2, wherein the branch angle of the radiating tree-shaped bionic micro-channel (2) and the parallel tree-shaped bionic micro-channel (6) is 100 degrees.
4. The temperature control device for mobile phone based on phase-change capsule and bionic micro-channel as claimed in claim 1, wherein the ratio of the upper and lower tube diameters of the radiating tree-shaped bionic micro-channel (2) and the parallel tree-shaped bionic micro-channel (6) is 0.7-0.9.
5. The temperature control device for mobile phone based on phase-change capsule and bionic micro-channel as claimed in claim 4, wherein the ratio of the upper and lower grade diameters of the radiating tree-shaped bionic micro-channel (2) and the parallel tree-shaped bionic micro-channel (6) is 0.8.
6. The mobile phone temperature control device based on the phase-change capsule and the bionic micro-channel as claimed in claim 1, wherein the working medium circulation channel (7) adopts a capillary wick as capillary pressure to drive the fluid to flow.
7. The temperature control device for the mobile phone based on the phase-change capsule and the bionic micro-channel as claimed in claim 1, wherein the mobile phone shell (9) is made of silica gel or rubber material, the partition plate (8) is made of metal thin plate, and the phase-change material arrangement area (3) is internally provided with organic or inorganic phase-change microcapsules.
8. The temperature control device for mobile phone based on phase change capsule and bionic micro-channel as claimed in claim 1, wherein the heat dissipation plate (1) is copper substrate or aluminum substrate.
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| CN111159867B (en) * | 2019-12-19 | 2022-05-31 | 联想(北京)有限公司 | Construction method of heat dissipation device, heat dissipation device and electronic equipment |
| CN111491493B (en) * | 2020-04-30 | 2022-02-18 | 联想(北京)有限公司 | Heat dissipation component and electronic equipment |
| CN112361857B (en) * | 2020-11-11 | 2022-02-15 | 中国工程物理研究院激光聚变研究中心 | Heat transfer enhancement method based on functional fluid coupling of fractal tree-shaped microchannel and phase-change microcapsule |
| CN112728790A (en) * | 2021-01-25 | 2021-04-30 | 上海海事大学 | Plate type solar chimney phase change capsule heat storage device with tree fork flow channel |
| CN114340262B (en) * | 2021-12-30 | 2023-08-29 | Oppo广东移动通信有限公司 | Shell, shell assembly and electronic equipment |
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| CN203633043U (en) * | 2013-12-03 | 2014-06-04 | 王敬敦 | Heat-dissipating back shell of portable electronic device |
| TW201616946A (en) * | 2014-10-29 | 2016-05-01 | Tai Sol Electronics Co Ltd | Heat sink module for mobile apparatus |
| CN105491859A (en) * | 2016-01-08 | 2016-04-13 | 云南科威液态金属谷研发有限公司 | Radiating method, radiating structure and radiating part for electronic equipment |
| CN205897915U (en) * | 2016-07-18 | 2017-01-18 | 华南理工大学 | Ultra -thin heat pipe is used in cell -phone heat dissipation |
| CN107771017B (en) * | 2017-12-05 | 2019-10-29 | 南通沃特光电科技有限公司 | Handset shell |
| CN108184007A (en) * | 2018-01-31 | 2018-06-19 | 于庆洋 | A kind of mobile phone protecting case |
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